9978722347 has 16 divisors (see below), whose sum is σ = 11466086400. Its totient is φ = 8588665440.

The previous prime is 9978722329. The next prime is 9978722387. The reversal of 9978722347 is 7432278799.

It is a cyclic number.

It is not a de Polignac number, because 9978722347 - 2⁷ = 9978722219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9978722291 and 9978722300.

It is not an unprimeable number, because it can be changed into a prime (9978722387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334518 + ... + 363124.

It is an arithmetic number, because the mean of its divisors is an integer number (716630400).

Almost surely, 2^9978722347 is an apocalyptic number.

9978722347 is a deficient number, since it is larger than the sum of its proper divisors (1487364053).

9978722347 is a wasteful number, since it uses less digits than its factorization.

9978722347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30306.

The product of its digits is 10668672, while the sum is 58.

The square root of 9978722347 is about 99893.5550823976. Note that the first 3 decimals coincide. The cubic root of 9978722347 is about 2152.9055611846.

The spelling of 9978722347 in words is "nine billion, nine hundred seventy-eight million, seven hundred twenty-two thousand, three hundred forty-seven".